what's going on with that headset, threaded converted to threadless?
Looks like it's still threaded, you can see the lower nut is still there. So I think it has a quill adapter, and then the rotation of the top nut is countered by the stem. Seems risky but maybe it works.
But then the stem would clamp on the threaded part of the fork as well, unless the steerer is too short for the frame, right? I have seen threaded headsets where the threads were milled off, to be used as threadless. A christmas mystery...
Really like that. Seems no bottle bosses on the down tube? And what's going on with that headset, threaded converted to threadless?